test: fix issues in test to fix memleak

tests/library/hashtable/test_hashtable.c

@@ -112,11 +112,7 @@ spec("hashtable") {
                 value *value = value_new(1337);
                 check(value_hashtable_insert(hashtable, key, value) == 0);
                 check(value != NULL, "value should not be NULL");
-                //value_destroy(&value);
-                free(value);
-                free(value);
-                value_new(1234);
-                free(NULL);
+                value_destroy(&value);
             }
 
             it("should return 0 with NULL as this param") {

tests/library/list/test_list.c

@@ -135,7 +135,7 @@ spec("list") {
             it("should return 0 with NULL as this param") {
                 value *value = value_new(1);
                 check(value_list_unshift(NULL, value) == 0, "return should not be 0");
-                //value_destroy(&value);
+                value_destroy(&value);
             }
 
             it("should return 0 with NULL as valueElement param") {